OpenAI·GPT

GPT-5.5

A 1M-context frontier model for complex knowledge work, computer use, coding, and scientific research.

LegacyLanguageReasoningCodingAgentMultimodalWeights not released

MODEL NUMBER043

Specifications

Only published specifications are shown.

Context

Input modalities

Text · Image

Open weights

Status

Legacy

A 1M-context frontier model for complex knowledge work, computer use, coding, and scientific research.

Compared with GPT-5.4 ↗

PreviousGPT-5.4— · — ctx

CurrentGPT-5.5— · 1M ctx

New capabilities Long-horizon agent Scientific research

Long-horizon agentComputer useCodingScientific research

2026-04-23General release

GPT-5.5 launched in ChatGPT and Codex.

2026-04-24API launch

GPT-5.5 and GPT-5.5 Pro became available in the API.

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